Here is a simple example I've composed that causes the finding for me. It's a simple program that prints to the console the contents of the root directory. It appears that the problem I'm seeing occurs when String constants are defined in a different class.
private class Commands
{
public static final String LS = "ls";
public static final String ROOT = "/";
}
public static void main(String... args) throws Exception
{
ProcessBuilder b = new ProcessBuilder(Commands.LS, Commands.ROOT); //Finding on this line
Process p = b.start();
new BufferedReader(new InputStreamReader(p.getInputStream())).lines().forEach(System.out::println);